Bubble generating device



FIG. 1 is a front elevational view of design for bubble generating device;

FIG. 2 is a back elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for bubble generating device, shown and described. 